Derrick



(:10 Model.) 2 Sheets-Sheet 1. O. M. LOVBRIDGE. DERRICK.

No. 548,375. PatentedOct. 22, 1895.

AN DREW EGRANAM. PHO'l'J-LTWEWASH IN WON B11 (No Model.) 2 Sheets-Sheet 2.

0. M. LOVERIDGE. DERRICK. No. 548,375. Patented Oct. 22, 1895.

ANDREW ESHAHAM.H'IUYO-LMIQWASHWGTDNJQ UNITED STATES PATENT OFFICE.

ORAN GE M. LOVERIDGE, OF WEAVERVILLE, CALIFORNIA.

DERRICK.

SPECIFICATION forming part of Letters Patent No. 548,375, dated October 22, 1895.

Application filed March 29, 1895.

To all; whom it may concern:

Be it known that I, ORANGE MERWIN LOVE- RIDGE, a citizen of the United States, residing at WeavervillaTrinily county,State of California, have invented an Improvement in Derricks; and I hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to derricks; and it consists in the details of construction, arrangement, and combination, all of which I shall hereinafter fully describe and specifically claim. The object of my invention is to provide a derrick which is adapted by reason of its adjustable boom to easily reach and to be connected with loads close by the mast and as far out as the length of said boom directed horizontally from the mast. This adaptability, in conjunction with the extension of the boom, makes it possible for a large radius of ground to be worked over without having to move the derrick, thus adapting the device for the particular use of raising large rocks and bowlders out of hydraulic mines.

A further object is to provide a derrick the swinging boom and the hoisting mechanism of which may be readily operated, the latter at different speeds, and the various parts may adjust themselves without cramping.

Referring to the accompanying drawings for a more complete explanation of myinvention, Figure 1 is a side elevation of my derrick. Fig. 2 is a front view. Fig. 3 is a top view of the driving mechanism. Fig. 4: is a crosssection of the boom on the line a: a: of Fig. 1.

A is the mast of the derrick, which at its lower end may be supposed to be suitably stepped, so that it. may axially turn. I-linged at b to the mast, near its lower portion, is the boom 13, which by reason of its hinge is adapted to swing through an arc in a vertical plane extending from a horizontal to as near avertical as may be. This movement of the boom is under the direct and immediate control of the operator, as said boom is intended to be raised and lowered whenever it is necessary to bring its upper end into or near the vertical plane of the load which is to be raised, so that the load-carrier may be let right down to the load without having to move the load to a proper position in which it can be connected with the boomthat is to say, if the rock or other weight to be raised be near the mast it is not necessary to roll it out under or nearly under the outer end of the boom, but the boom itself is swung upwardly until its upper end comes over the rock, and if another rock be farther out the boom is lowered until its upper end comes in position over said other rock, and so on throughout the radius of the length of the boom. In order to effect this adjustment of the boom I have connected with its upper end a double block 0, and in the top of the mast on one side thereof a sheave D, and between these extends a line E, the detailed course of which I shall hereinafter describe, it being sufficient at this point to say that the end of the line extends down to a Winding-drum F, which is actuated by suitable power and is under the direct control of the operator. By moving this drum the line may be wound up or let out, thereby easily and immediately swinging the boom through an arc in a vertical plane to regulate the vertical plane of its outer end.

The boom B may be in a single piece; but in order to make it extensible, so that it may be lengthened out at will, 1 make it in sections of any suitable number. I have here shown three such sections, the lowermost being represented by b, the middle one by b and the uppermost by h The adjacent ends of these sections merely abut, and in each is seated a metallic wearing-sleeve 12 which receives a coupling-pin 12 This joint is tight-. cued and rendered secure by means of a cable 6, rendering freely through pulleys b", one on each section of the boom, and through a small pulley g of a block G.

The abutting ends of the sections of the boom are provided with straps b to keep them from splitting, and in order to permit the necessary movement of the small pulleys b" on the sections to accord with the different inclinations of the boom I pivot the frames b of said pulleys to suitable lugs or ears 5 on straps b on said boom-sections. All the sections are thus united, and for the three sections here shown I have shown two blocks G, whichlie in the course of the boom-adjusting line E, which said course, under the circumstances of a three-part boom, is as follows: The end of the line beginsat the point 6, where it is secured to the mast. It thence passes down around the first of the sheaves G, up around one sheave of a double block H, secured to the mast, thence down around the other sheave G and back around the other member of the double blockll, thence out to the sheave C on the end of the boom, around said sheave, and back through the sheave D on the mast, heretofore mentioned,and down to the winding-drum F. Thus there isa constant strain on the sheaves G, which causes them to tighten on their freely-rendering cables b and to hold the sections of the boom firmly together. tions thus united may turn readily axially to provide for all the adjustment necessary to avoid cramping and to permit the various ropes to render straight through the pulleys. Also, this connection is readily made and broken, so that the boom may be of thelength of one section and easily lengthened out to two or more sections or reduced again, as may be desired.

I is the load carrier or hook, in the block of which is a double block 2'.

J is the hoisting-line. The end of this is secured to the block *0, and thence passes back and forth between the double sheaves of block 'i and a block K, secured to the end of the boom above, and thence over a sheave K, mounted in a suitable bracket near the boom end, and thence to and down over sheave D in the top of the mast and to a Windlass or winding-drum L below. This winding-drum L is provided on one end with a gear Z and on the other end with another gear Z of larger diameter. Its shaft is also provided with a strap-brake mechanism Z and a pawl-andratchet mechanism Z This drum L is driven by the following mechanism:

M is a vertical shaft to which the initial power is applied. This shaft carries on its upper end a beveled pinion m, which meshes with a beveled pinion n on a counter-shaft N, whereby said counter shaft is driven. Mounted and adapted to slide upon a feather on this counter-shaft N is a double pinion, one of which n is of largerdiameter than the other and N IS adapted to engage with the smaller-diameter gear Z of the drum L, while the other and smaller-diameter pinion n is adapted to engage with the larger-diameter gear Z of said drum. Thus by throwing the double pinion into or out of connection with either of the gears Z and Z the speed of the winding-drum and the consequent time of hoisting the load may be varied to suit the character of the load or other conditions.

The winding-drum F of the boom-adjusting line has a gearf, and its shaft has on its outer end a strap-brake mechanism f and a pawland-ratchet mechanism f. The gear f is driven by a pinion n on the shaft N and is adapted to slide on a feather thereon, so as to be thrown into and out of engagement with said gear at will.

In order to compensate for the twisting of At the same time these sec the parts and to cause the lines to render straight through the pulleys and thereby avoid cramping, the head of the mast to which the several connections are made is an axially rotary one, and is constructed as follows: Upon the mast near its head are two flanged brackets P, encircling it, and upon these brackets are mounted and adapted to turn rings Q, which are connected by braces q, so that said rings form a turnable sleeve or bracket. In suitable frames carried by these rings, one on each side, are mounted the two sheaves D and D, heretofore mentioned, and to this turnable sleeve are connected the block H and the end of the line E. By the turning of this sleeve there will be no cramping, and the lines will render true and straight through the pulleys.

R is a sheave carried by this turn able sleeve and over which a main-line is to be put.

S represents the guys extending from the head of the mast.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a derrick, the combination, of a mast, a boom pivoted thereto, a load carrier suspended from the outer end of the boom, a line connected with said boom to adjust it at various points in an arc in a vertical plane, a winding drum with which said line is connected and a turnable head or bracket on the top of themast for directing said line to the drum, said turnable head consisting of the separated and superposed flanged brackets P, the rings Q mounted to turn between said flanges, and braces connecting one ring with another substantially as herein described.

2. In a derrick, the combination, of a mast, a boom pivoted thereto, means comprising a coupling pin between adjacent sections, a pulley on the adjacent end of each section, a cable passing from one pulley to another, and a suspended pulley block having a pulley over which said cable passes whereby the boom is lengthened or shortened, a line for moving the boom to various points in an arc in a vertical plane, and a winding drum under the control of the operator for operating said line.

3. In a derrick, the combination of a mast, a sectional boom pivoted thereto, a coupling pin for joining adjacent sections of the boom, a pulley on each of the sections, a freely ren dering cable passing around said pulleys, a pulley block having a pulley around which said cable passes, a load carrier, a hoisting rope suspending the load carrier from the end of the boom, a line connected with said pulley block and with the end of the boom for adjusting the boom to various points in an arc in a vertical plane, and independent drums under the control of the operator for separately operating the hoisting and boom operating lines.

4. In a derrick, the combination of a mast, a boom pivoted thereto, a load carrier, a hoisting rope suspending the load carrier from the end of the boom, a line connected with the end of the boom for adjusting it to various points in an arc in a vertical plane, independent drums under the control of the operator for separately operating the hoisting and boom operating lines, and means for operating the drums, consisting of a vertical power shaft having a pinion, a counter-shaft having a pinion engaging with the pinion of the vertical shaft, and slidahle pinions on said counter-shaft for engaging separately gears on the winding drums.

5. In a derrick, the combination of a mast, a boom pivoted thereto, a load carrier, a hoisting line suspending said load carrier from the end of the boom, a line secured to the end of the boom for moving it to various points in an arc in a vertical plane, a turnable head on the top of the mast by which said lines are guided and to which the boom operating line is attached, said head consisting of superposed and separated flanged brackets, rings fitted to rotate between the flanges and a connection from one ring to another, and separate winding drums for actuating said lines.

6. In a derrick, the boom, made in separate sections with ends abutting, a coupling pin in the axis of said sections, a line suspending the boom, blocks by which said line is di rected to the various sections, pulleys on the abutting ends of the sections, freely rendering cables passing around said pulleys and pulley blocks suspended from the line and having pulleys around which the freely rendering cables pass.

7. In a derrick, the combination of a mast, a vertically adjustable boom, a load carrier carried by the boom, a line for operating the load carrier and a separate line for adjusting the boom, a drum for actuating the boomline, the drum for actuating the hoisting line having gears of different sizes, and a double pinion of difierent sizes adapted to be thrown into and out of engagement with the gears to vary the speed of rotation of the hoisting line drum.

In witness whereof I have hereunto set my hand.

ORANGE M. LOVERIDGE.

Witnesses:

S. H. NOURSE, H. F. ASCHECK. 

